Plotting Multiple Graphs in MATLAB

[adnan jahan]

Dear Fellows,

I need to plot a graph in matlab, and stuck in obtaining multi plot from it for different constant values... following example will explain my situation.


x=1;
y=3;
c=x^2+4y+9z
z=linspace(0,1.2);
plot(z,c,'r')
in this I want to plot for y=3,y=4,y=5 and y=0 all curves in one graph.

 

[jhae2.718]

Use the "hold on;" command and multiple plot statements.

 

[adnan jahan]

For different plot I need to past the whole program and change the only variable(y) and
plot(x,y,'r')
hold on
plot(x,y1,'r--')
hold on
plot(x,y2,'b')
Is this what you are saying?

can you please give small example so that I can understand clearly...

 

[mikeph]

small example,

x = 0:0.1:10;
y1 = x^2 + 2x + 1;
y2 = x^2 + 4x + 1;

so you have two curves, y1 and y2.

plot(x,y1,'r');
hold on
plot(x,y2,'b');

this will plot y2 on the same axis as y1. you only need to type hold on once; after you type it, all further curves are put on the same plot.

 

[alphy]

Hello,

Thank you for reaching out for assistance with plotting multiple graphs in MATLAB. I understand your situation and I will be happy to help you with this.

To plot multiple graphs in MATLAB, you can use the "hold on" command after your initial plot command. This will allow you to plot multiple curves on the same graph. Additionally, you can use the "legend" command to label each curve with the corresponding value of y.

Here is an example code that you can use for your situation:

x = 1;
y_values = [0, 3, 4, 5]; % array of y values
z = linspace(0,1.2); % create array of z values

hold on % use this command to plot multiple curves on the same graph

for i = 1:length(y_values) % loop through each y value
c = x^2 + 4*y_values(i) + 9*z; % calculate c for each y value
plot(z, c) % plot the curve for each y value
end

legend('y = 0', 'y = 3', 'y = 4', 'y = 5') % label each curve with corresponding y value

I hope this helps you plot your desired graph. Let me know if you have any further questions or need any additional assistance. Keep up the good work in your scientific endeavors!

Best,